Abstract
Two construction- grade steels— G40.21 350 WT and G40.21 350 AT— were tensile tested under a range of temperature and strain- rate conditions. Results showed that both the strain- hardening exponent and strength coefficient at first decrease with increasing temperature, then increase with increasing tempera-ture and reach a maximum at a temperature between 523 and 573 K before decreasing. With increasing temperature, the strain- rate dependence of the strain- hardening exponent and the strength coefficient changes from positive to negative. This behavior reflects the effects of strain aging on the strain- harden-ing exponent and the strength coefficient.
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